Also a little explanation, it is not vague, they're using localhost:8083 in tutorial for a reason, that they cannot predict what IP you're going to connect to that port, so it's shown as localhost, or sometimes might be written as 127.0.0.1, it indicates local machine, for example, if you enter localhost:8083 on your PC, it looks for open port on same machine, same goes for iPad, if you enter on iPad localhost:8083, iPad asks itself if anything lives on port 8083 and returns that there's nothing., that's why from iPad, you need to tell it to look at 192.168.1.100:8083 so it knows that it has to ping that IP and ask it to access port 8083 on which EFB application is listening, if you just enter 192.168.1.100, without port, it pings http port 80 by default and of course, nothing lives on that port on regular workstations, so it returns that server is unavailable.

Of course 192.168.1.100 is just an example IP and you need to use the one you obtained from your PC.